is there a seperate all india rank list for JEE Mains january and apri? and if we give JEE Main in april can we appear for JEE advance in same year?

NTA Scores are given in percentile.
Percentile is calculated by the ratio of the number of values to the total number of values . You cant say/depict your actual score/rank from your percentile neither can you calculate it by only marks. To calculate the actual score/rank/percentile you would need to know the number of students who appeared in the examination and the highest score, average cut offs and the highest score. while as marks are calculated based on the right questions you have attempted, out of the total marks you have obtained for the right number of questions marks from wrong questions marked are deducted from the total.

NTA announces the result of JEE Main/Advance in the form of a percentile score in every attempt or exam of JEE Main/Advance. The All India Rank (AIR) of candidates in JEE Main is calculated by taking the best score out of four attempts and are provided after the result of fourth exam. Candidates are able to check the detailed marks vs ranks of JEE Main/Advance after the conclusion of the exam.

Two types of ranks are given at the end:

1. AIR: All India Rank
2. CR: Category Rank

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Hey

Since last year there are 2 attempts of JEE Mains being conducted by NTA every year. One in January and other in April. The candidate will get different percentiles for both the attempt but after the April attempt, 'Normalization' of scores by NTA would be done, a final cumulative rank list would be generated.

It depends upon the candidate whether he wish to take both attempts or just one. You can give JEE Advanced the same year after notification is out soon after JEE Mains final result.

For further doubts, ask us.